Bead for pneumatic tires and reenforcing element therefor



Dec. 14, 1926.

1,611,146 A. C. HOPKINS BEAD FOR PNEUMATIC TIRES AND EENFORCING ELEMENTTHEREFOR Filed August 15, 1925 INVENTOR qo rf/rs ATTORNEYS Patented Dec.i4, 1926.

ARTHUR norxmsgor ms, urcinsim, lissieiaon r commnr, ormrns, MICHIGAN.

BEAD son rimum'ric Trans AND NATIONAL srmnaan- REENFORCING ELEMENTTHEREFOR.

' Application filed August 15, 1925. Serial a... 50,514.

This invention relates to improvements in beads for pneumatic tires andreenforcing elements therefor.

The main objects of this invention are:

5 First, to

in the manufacture of tires by different methods or processes, includingthe.Hartford rocess or other rocess'es r uirin 10 a rolling or turningmovement. 7

Second, ,to provide animproved tire reenfor'c'i'ngelement which issubstantially non-stretchable lon itudinally and in which substantiallythe fu tensile strength ofthe strands is available; v I Objectspertaining to details and economies of my invention will,definitelyappear from the detailed description to follow.

I accomplish the objects of my invention following specification. Theinvention is clearly defined and pointed out in the claims. A structureembodying the features of my invention is clearly illustrated in theaccompanying drawing forming a part of this application, in which: I ig.1 is a cross-section of a pneumatic tire embodying the features of myinvention;

. Fig.- 2 is a fragmentary perspective view 3 of a tire bead embodyingthe, features of my invention, alternate strands of the reenforc ingelement being shown in blackfor convenience in illustration;

85 of my improved tire bead reenforcing element;

Fig. 4is' a fragmentary view illustrating the braided or interlockingrelation of the strginds in the flat; and

1 spira ing of the strip shown in' Fig. 4 which results in the cable-hkeform shown in Fig. 3. In the drawing similar reference numerals indicatesimilar parts in all. of the'views."

Referring to thejdrawing, in Fig. 1 the tire casing 1 is shownconventional] adapt: ed to receive the usual bead'2whi'ch is in praticeof a suitable rubber composition with the reenforcing element designatedgeneral- .ly by the numeral 3 embedded therein, In the embodimentillustrated the reenforci'ng element is given three coils or wraps.

This reinforcing element is formed of 1 strands of wire which forconvenience in illustration are designated as alternate black rovide animproved bead for-- pneumatic tires which is adapted for use by thedevices and means described in the Fig. 3 is an enlarged fragmentaryview as a conventional illustration of the and white strands 4 and 5,respectively.

:It will be understood that these strands are of the same material andthe color is used for the purpose of illustrating the relation of thestrands in theelement.

The strands 4 and 5 are bonded together by successively looping eachstrand back and forth with the ad a ceiit strands at the sides .thereof,as "clearly shown in Fig. 4, the reaches of thes'trands being relatively long and the reaches of co-engaging strands being disposed in.superimposed crossed contacting relation. The co-engaging bights of thestrands are disposed in alinemeiitfrom edge to edge-of the strip a dalso in con,-

7.0 tact, as indicated at.6. T e strands thus bonded are spirallytwisted, as indicatedin 1 Fig. 5, the general position of the strandsbe: ing' indicated in Fig. 3. In the manufacture of the element thestrands .4 are looped around the coacting strands 5b means of:continuously rotating spool or obbin carriers, which produces atorsionin these strands 4, resulting in a s iral folding. or twistin of theseveral 1 While in this. form the element is killed, astwillbeunderstoodby those skilled in this The braiding operation sets 11''. torsionaltwisting stressesin 'ceiitain of-t lie strands so that they tendtoetwist spirally as con-- ventionally shown in Fig. 5, resulting in'the cable-like'strand of, Fig. 3. The reenforcing elementbeing -..killedor set? in this ca le-like fornimaintainsits form that is, there is nosubstantial tendency for it to further-twist or kink'orto unwrap. Thisspiraling further tends to equalize stresses within the stri so that theelement may be ye? easily andled and placed in any desire position, andmay be utilized in any of the well-known processes or methods ofnanufacturing'tires with which I'am famillit!" including the processeswhich require rolling or turning. 1

A furtheradvantage is that the full tensile strength of the strands issecured and there are no substantial'shearing stresses on the strands.

Having thus described my invention what 1 I claim as new and desire tosecure by Let-Q ters ,Patent isz.

, 1. An element of the classdesc'ribed comprising a plurality of strandsof wire braided together with the several strands alternately .11

ooped strands.

and successively looped back and forth with adjacentstrands with thebights of the corresponding loops alined and with the reaches ofco-engag'ing loops in crossed relation so that each strandhas directlooped bonding engagement with the strands at the sides thereof, theseveral bonded strands being spirally twisted to a cablef-like. form.

2. An element of the class described comprising a plurality of strandsof wire bonded together by successively and alternately disposedco-engaging loops with the reaches looping the several strands back'andforth with adjacent strands with thecorresponding reaches of their loopsin crossed relations, the braided strands, being spirally twisted tocable-like form.

4. An element of the class described'com- I prising a plurality ofstrands of wire braided'together with the'severalstrands alternately andsuccessively looPedtback and forth with ad aCent strands with thereaches of coacting 100 s in crossed relation and their correspon ingbightsinftransverse alinement, the strands so bonded being spirallytwisted.

An element of the class described com prising a plurality of wirestrands, each strand being looped successively and alternatelyback andforth with the strands' atthe sides thereofi the strands so loopedtogether being spirally twisted as a unit. 7 In1 witness whereof I havehereunto set In h an v a a ARTHUR o. HOPKINS. l

